but they've been used in some especially deadly shootings, like this one last july at a san francisco law firm that killed eight. that led a california senator to propose a ban on 19 types of semiautomatic rifles, pistols and shotguns. that's now in the senate crime bill. it targets weapons that have detachable clips for bullets, folding or telescoping stops and such features as bayonet mounts. >> the bill sponsor was successful. the bill became law. the bill's sponsor was senator diane feinstein of california. >> we, as a country, decided to let it expire. remember how i said the vote on the ban on plastic guns back in the 80s was a very lopsided vote. it was 413 votes in favor and only four votes against? dick cheney was one of the four designed to slip by airport x-ray machines when he was in the congress. he also voted against the reagan ban on bullets designed to pierce body armor. and when the assault ban came up in 2004, bush and cheney made sure it expired. this year, she said she's going to bring the assault weapons ban back. >> the same bill will be introduced in the house,